Several test can be done to estimate the blood sugar level
1) RPG (random plasma glucose): this is a blood test done at any time of the day to check blood sugar level at that point in time. If the RPG value is >200 mg/dl (11.1mmol/L) of blood, it indicates that person has diabetes .Further tests may be required for confirmation
2) FPG (Fasting plasma glucose): this tests the amount of sugar in the blood stream after one has not eaten for 8-10 hours (over night fasting). This is usually done first thing in the morning before breakfast. An FPG value >126 mg/dl (.7.0mmol/L) indicates that person has diabetes
3) Glycated haemoglobin (Hba1C): this test measure how well the blood sugar has been controlled over the past 3 months. If the Hba1C is >6.5% (47.0mmol/mol) it indicates the presence of diabetes
4) OGTT (oral glucose tolerance test): this is another type of test for diabetes. The blood sugar level is checked in the fasting state and then 2 hours after drinking a certain amount of glucose. It show how the body process glucose. If the 2 hour value is >200 mg/dl (11.1mmol/L), it indicate the presence of the diabetes.
